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Many pre-packed goods contain too much sugar and we would all benefit by avoiding these. But most tinned, processed and dried foods contain large amounts of fat, protein, carbohydrate, vitamins and minerals.

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“Junk” food is difficult to define and white sugar is probably the nearest contender for the title.

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Alcohol is also high in calories, but beer and wine contain some of the B vitamins. Wine is a good source of iron, so even a teetotaler could not describe all alcohol as useless, nutritionally speaking.

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Big animals, such as lions and tigers, can be photographed as they bound happily back to their families and dinner.

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In addition, five probes were sent to rendezvous with Halley's comet. So exploration of the solar system is more or less under way.

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Would orbital stations be choice places from which to try to communicate with extraterrestrial intelligences?

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At present we can go back 10 to 12 billion years. We have to go a bit farther back still, and maybe catch them in the act of birth. 

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But it's their great-great-great-grandchildren who would finally reach those stars. And they wouldn't even know where to stop.

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Objects that distant are necessarily very dim, so ideal conditions are needed to observe them. 

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But visiting the stars is something else again. Light takes four years to reach the nearest stars, so you can see that it would take satellite hundreds of thousands of years.

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There are 100 billion stars in our galaxy, and over a billion yellow stars like our sun. 

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Of course, if the earth were to become overpopulated, we can imagine sending families in space vessels to colonize the nearest stars.

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It's not particularly proper to use radio communication unless on certain wave lengths that are absorbed by the atmosphere.

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To observe the birth of a galaxy that happened so long ago, you have to see a very long way. 

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When the sky is clear, the sun and the stars help to guide the course. If they are followed one is saved from traveling in a circle, as the lost are pretty sure to do in a dense forest.

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As a rule the denser growth of moss on trees is on the north side. This knowledge may help find the direction, but it is better to carry a small pocket compass 

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Each man carried a section, and two made a tent, into which two men crawled when it rained, but in dry weather they preferred to sleep in the open, even when it was freezing. 

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During the autumn and when the weather is dry and the nights not too cool, the best way to camp is in the open, sleeping on beds of boughs, about a roaring fire, and with one blanket under and another over.

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A shack built of crossed logs requires some time to build and some skill to make, but it is not beyond the reach of any boy who has seen - and who has not - an old-fashioned log shanty. 

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A good plan is to follow down the course of a stream, which always flows into a larger body of water and will lead to some abode.